Cover photograph (Copyright © 2000, American Society for Microbiology. All rights reserved.): Glycogen suppressor mutants caused by growth of an Escherichia coli csrA rpoS mutant strain in the presence of acetate. A 24-h culture was streaked from tryptone broth containing 50 mM sodium acetate onto Kornberg agar. The plate was incubated overnight, and intracellular glycogen in the resulting colonies was stained with iodine vapor to reveal a mixture of glycogen phenotypes. Growth of the resulting genetically stable, glycogen-deficient mutants was no longer sensitive to inhibition by acetate. (Photograph by Bangdong Wei and Tony Romeo.) (See related article on page 1632.)